Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Indeed, Allah Almighty said: 'O son of Adam, if your sins were to reach the clouds of the sky and then you sought My forgiveness, I would forgive you, and I would not mind. O son of Adam, if you were to come to Me with sins nearly filling the earth, and then you met Me not associating anything with Me, I would come to you with forgiveness nearly filling it.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Bakr bin Abdullah al-Muzani except Sa'id bin Ubayd, and no one from Sa'id except Kathir bin Fa'id; Abu Asim is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4305
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 1571، 1572، والترمذي فى «جامعه» برقم: 3540، والبزار فى «مسنده» برقم: 6760»